JP2010030342A - Curtain airbag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a curtain airbag facilitating assembling work of an airbag fixing cloth and provided with the fixing cloth having sufficient tensile strength capable of withstanding at expansion of the airbag. <P>SOLUTION: The curtain airbag is provided with: an airbag body; and a plurality of airbag fixing clothes having a mounting hole inserted with a mounting member. The airbag fixing cloth comprises folding a sheet of base cloth, and the curtain airbag has at least three bending parts at an upper end and respective two bending parts at left and right ends. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a curtain airbag, and more particularly to a curtain airbag provided with an airbag fixing cloth having a sufficient tensile strength even when the airbag is deployed.

  As a safety device for protecting an occupant that protects an occupant from an impact when a vehicle collides, an airbag device is widely used. As for the type, in addition to the conventional airbag apparatus for the driver's seat and the passenger's seat, a curtain airbag apparatus has recently been mounted on the vehicle. A curtain airbag is an airbag that is deployed between a vehicle inner wall and an occupant in order to protect the occupant from the impact of a side collision. This curtain airbag is fixed at several locations along the upper side of the vehicle side glass by a fixed cloth, and is deployed from the upper side to the lower side so as to cover the side glass when the bag is inflated. Sufficient tensile strength is required for the joint (sewn) portion with the main body.

  In order to increase the strength of the joint portion between the fixed fabric and the airbag body, the airbag body fabric and the fixed fabric are integrally cut, and the joint portion is not provided in the first place. And increasing the number of stitches, increasing the number of times of sewing, and increasing the length of the base cloth for the sewing allowance.

  Further, as a method for increasing the strength of the fixed cloth itself, Patent Document 1 discloses that the airbag main body cloth and the fixed cloth are integrally cut, and at least the deployment and inflation direction around the attachment hole provided in the fixed cloth portion. It is disclosed that a high strength portion is provided on the opposite side. And it is described that it is possible to prevent the breakage from occurring and proceed from the mounting hole due to the reaction force when the airbag is deployed, and that there is no increase in cost due to an increase in parts. . However, there remains concern over slipping of the base yarn. With respect to FIG. 4, it is described that weaving a higher density weaving yarn (warp yarn) than the weaving yarn (warp yarn) of the general portion of the airbag bag base fabric at the corresponding portion of the attachment portion. By increasing the density of only the yarn (warp), the number of intersections where the weft and the warp intersect decreases, so it is expected that the weft will slip easily. Also, in the example shown in FIG. 9 and the like using thick yarn, the strength of the woven yarn can be increased by thickening the yarn, but slipping easily occurs because the density decreases. Sliding here means that the weft slips between the warps (or the warp slips between the wefts). Generally, the weaving thread is thinned and the weaving density is increased (the crease is narrowed). The slippage is less likely to occur.

  As another method, it has been proposed to increase the number of fixed cloths used in one fixed portion. However, if the number of sheets is increased too much, the fixing point becomes thick and the assembly becomes difficult. Furthermore, since the number of parts increases, problems such as forgetting to attach easily occur, and the workability of installation becomes complicated.

  Therefore, Patent Document 2 discloses a method in which a single cloth cut from a fixed cloth is folded in half with the center line as an upper edge. As a result, the upper edge where the high tension acts is the folded portion, and the lower edge where the high tension does not act is the joint due to sewing, adhesion, etc. It is possible to effectively suppress the occurrence of fabric breakage and misalignment. Since the upper edge is folded back, wefts above the bolt mounting hole can be prevented from slipping out between the warp yarns, but wefts near the bolt mounting hole can be prevented from slipping out. There is a problem that can not be.

JP 2003-205817 A JP 2000-33846 A

  The present invention solves the above-described problem, and provides a curtain airbag provided with a fixed cloth having a sufficient tensile strength that can be easily assembled to the airbag fixed cloth and can endure when the airbag is deployed. Objective.

  That is, the present invention is a curtain airbag comprising an airbag body and a plurality of airbag fixing cloths having attachment holes for inserting attachment members, wherein the airbag fixing cloth is a single base cloth. And a folding airbag having at least three bent portions at the upper end and two at the left and right ends.

  It is preferable that the airbag fixing cloth further has slits at left and right ends.

  It is preferable that the airbag fixing cloth is apparently composed of six or more base cloths.

  ADVANTAGE OF THE INVENTION According to this invention, the curtain airbag which provided the fixed cloth which has sufficient tensile strength which can be endured at the time of airbag expansion can be provided, without increasing the number of sheets of a fixed cloth.

  The curtain airbag according to the present invention includes an airbag body and a plurality of airbag fixing cloths having attachment holes for inserting attachment members, and the airbag fixing cloth folds a single base cloth. And at least three bent portions at the upper end and two at the left and right ends.

  The bent portion is a ring portion that is formed when one base fabric is folded into two. (Appearance) When a two-layer base fabric is folded into two, two folded portions are formed. Will be able to. Moreover, the said bending part does not need to be formed over the full length of an upper end or a left-right end, and should just be formed above the attachment hole of a fixed cloth at least.

  The airbag fixing cloth (hereinafter simply referred to as a fixing cloth) is a cloth attached to the upper edge of the airbag body in order to fix the airbag body in the vehicle. The airbag main body and the airbag fixing cloth may be integrally cut, cut separately, and may be joined later.

  The curtain airbag of the present invention is characterized by the configuration (shape / folding method) of the fixed cloth provided thereon, and an example thereof will be described with reference to the drawings. It should be noted that the following description is a detailed explanation of specific embodiments of the present invention, and the present invention is not limited to such embodiments, and various other implementations are within the scope of the present invention. It will be apparent to those skilled in the art that the form is possible.

  FIG. 1 is a schematic plan view showing a curtain airbag 1 of the present invention. The airbag main body 2 is formed by overlapping two base fabrics of the same type, and a peripheral portion except a part is sewn with an outer peripheral sewing thread 4. In addition, in the opening part which is not sewn, it is attached to the inflator (not shown). A plurality of the fixed cloths 3 are attached to the upper edge portion of the airbag main body cloth 2 by a fixed cloth sewing thread 5. The fixing cloth 3 is provided with an attachment hole 6 so that an attachment member such as a bolt can be inserted from the inside of the vehicle and fixed to a pillar or the like.

  The fixed cloth 3 used in the present invention is, for example, rectangular as shown in FIG. A sectional view taken along line bb passing through the attachment hole 6 is shown in FIG. 2B, and a sectional view taken along line aa is shown in FIG. As shown in FIGS. 2B and 2C, the fixed cloth 3 has three bent portions 7 at the upper end and two bent portions 8 and 9 at the left and right ends, respectively. In addition, the fixed cloth 3 shown in FIG. 2 is formed by superimposing six base cloths, and the bent portions at the left and right ends are formed from the attachment hole 6 to the upper end of the fixed cloth as will be described later.

  It is preferable that the fixed cloth 3 is made of six or more base cloths in appearance. The upper limit is not particularly limited, but it is preferably 10 sheets or less because it becomes difficult to sew if the thickness of the fixing portion becomes too thick. In addition, when the number of fixed fabrics stacked is less than 6, the strength tends to decrease.

  It is important that three bent portions are provided at least at the upper end of the fixed cloth 3 and two at each of the left and right ends. When the airbag is deployed, the curtain airbag is pulled downward with the bolt inserted into the attachment hole 6 as a starting point, so that a load is applied to the fixed cloth from the bolt (attachment hole) to the upper end. Therefore, by providing a plurality of bent portions 7 at the upper end portion of the fixed fabric, wefts are prevented from slipping off from the base fabric end of the upper end portion, and further, by providing the bent portions 8 and 9 at the left and right end portions, the weft yarn This prevents the end of the weft from being pulled out by the force of pulling the thread to the upper center. By providing the bent portions at the upper end portion and the left and right ends at the same time, such an action works, and even if the number is the same (apparent), the tensile strength can be dramatically improved. In addition, although a bending part may be provided in all four sides, when the said effect | action is considered, it is not necessary to necessarily provide in a lower end.

  The said fixed cloth 3 can be produced from the cutting cloth 11 shown in FIG. The cut cloth 11 has an area 6 times as large as the final size of the fixed cloth 3 so that the obtained fixed cloths 3 are apparently stacked in six sheets. Furthermore, it is a shape in which a bending part is formed in the upper end and right-and-left end of the fixed cloth 3, for example, it is a shape like FIG. 3, but it is not limited to this. By fixing the obtained cut cloth 11 three times along the folding line (broken line), the fixed cloth 3 used in the present invention can be obtained. Note that the attachment holes 6 may be cut out in advance at six locations before folding the cut cloth 11, or may be cut out in a stacked state after stacking.

  The cut cloth 11 may be cut along the warp and the weft, or may be cut by a bias so as to cut the warp and the weft.

  In order to facilitate folding, it is preferable to provide slits 10 (solid lines) at the left and right ends of the fold line portion. In FIG. 3, a slit is provided from the point where the line extending from the attachment hole 6 in the weft direction and the fold line intersect to the lower end of the fixed cloth. Here, as described above, a plurality of bent portions are necessary at the left and right ends of the fixed cloth in order to prevent the weft from coming off when the airbag is deployed. However, since the load is applied from the attachment hole to the upper end portion of the fixed cloth, the bent portions do not necessarily exist at the left and right ends below the attachment hole. This is true when the cut fabric is cut along warps and wefts. When the cut cloth is cut with a bias, as shown in FIG. 19, the line where the wefts near the attachment hole intersect with the left and right ends of the fixed cloth is inclined with respect to the fixed cloth. Is preferably present at least from the intersecting point to the upper part. FIG. 19C is a cross-sectional view taken along the line aa′-a.

  In FIG. 2, an apparently six-layer fixed cloth is illustrated, but as an example, an apparently four-layer fixed cloth is shown in FIG. 4. 2A is a plan view, FIG. 4B is a cross-sectional view taken along the line bb passing through the mounting hole 6, and FIG. 4C is a cross-sectional view taken along the line aa. Show. As shown in FIGS. 4B and 4C, the fixed cloth 3 has three bent portions 7 at the upper end and two bent portions 8 and 9 at the left and right ends.

  The said fixed cloth 3 can be produced from the cutting cloth 11 shown in FIG. The cut cloth 11 has an area that is approximately four times as large as the finished size of the fixed cloth 3 so that the obtained fixed cloths 3 are apparently stacked four times. Furthermore, it is a shape in which a bending part is formed in the upper end and right-and-left end of the fixed cloth 3, for example, it is a shape like FIG. 5, but it is not limited to this. By fixing the obtained cut cloth 11 three times along the folding line, the fixed cloth 3 used in the present invention can be obtained.

  Here, as shown in FIG. 5, when the cut cloth 11 is provided with a folding margin 12, when folded, the obtained fixed cloth 3 has three bent portions at the upper end and two bent portions at the left and right ends, respectively. Can be formed. The shape of the folding margin 12 is not particularly limited, and may have a curve as shown in FIG. 5 or may be a straight line. Especially, it is preferable to have a curve in that the yarn is not easily frayed after cutting.

  The fixing cloth 3 used in the present invention preferably has a strength (breaking strength) of 2000 N or more when pulled through a bolt through the mounting hole 6 at a speed of 500 mm / min and broken. If the breaking strength of the fixed fabric is less than 2000 N, it tends to be difficult to protect the occupant when the curtain airbag is actually deployed. Furthermore, it is preferable that the strength (breaking strength) when broken is 3000 N or more. When the breaking strength is 3000 N or more, it is possible to reduce the number of fixing cloths installed in the airbag.

The curtain airbag of the present invention can be manufactured as follows.
First, the base fabric is cut into a desired curtain airbag shape to obtain two main body fabrics. Next, the main body cloth is overlapped and stitched with the outer peripheral sewing thread 4 to obtain the airbag main body 2. The fixed fabric 3 produced as described above is joined to the upper end portion of the obtained airbag body 2 to obtain the curtain airbag 1 of the present invention.

  The fixing cloth 3 is joined by sewing or adhesion. Moreover, it is also possible to obtain the curtain airbag of the present invention by integrally cutting the airbag main body cloth and the cut cloth 11 and folding the cut cloth 11 in the integrated state to form the fixed cloth 3. is there.

  The number of the fixed cloths 3 to be joined to the airbag body 2 may be two or more, and can be appropriately determined depending on the required tensile strength, the material of the base cloth, and the like. Especially, it is preferable that it is three or more at the point of intensity | strength.

  The base fabric constituting the airbag body fabric used in the present invention and the base fabric constituting the fixed fabric may be the same material or different.

The base fabric is made of fibers and is used in the form of a fabric.
Examples of the fibers used include polyamide fibers such as nylon 6, 66 and 46, aromatic polyamide fibers (aramid fibers) represented by a copolymer of paraphenylene terephthalamide and aromatic ether, and polyethylene terephthalate. Polyester fibers, wholly aromatic polyester fibers, vinylon fibers, rayon fibers, polyolefin fibers such as ultra high molecular weight polyethylene, polyoxymethylene fibers, sulfone fibers such as paraphenylene sulfone and polysulfone, polyether ether ketone fibers, poly Organic fibers such as etherimide fiber and polyimide fiber, and inorganic fibers such as glass fiber, ceramic fiber, carbon fiber and metal fiber may be used, and these may be used alone or in combination. Among these, polyamide fibers such as nylon 6, 66, and 46 are preferable from a comprehensive viewpoint such as strength, durability, and cost.

  These fibers include various additives that are usually used to improve spinnability, processability, durability, and the like, for example, heat stabilizers, antioxidants, light stabilizers, anti-aging agents, and lubricants. One or more of a smoothing agent, a pigment, a water repellent, an oil repellent, a concealing agent such as titanium oxide, a gloss imparting agent, a flame retardant, and a plasticizer may be used. In addition, when it is desirable to weave the calami weave, processing such as twisting, bulking, crimping, winding, or gluing may be performed. Further, as the form of the yarn, in addition to the long fiber filament, a spun yarn of short fibers, a composite yarn of these, or the like may be used.

The fabric structure may be any of woven fabric, knitted fabric, and non-woven fabric.
When the fiber fabric is a woven fabric, it may be a plain weave, a weave weave (basket weave), a lattice weave (ripstop weave), a twill weave, a knot weave, a tangle weave, a imitation weave, or a composite structure thereof. In some cases, in addition to the two axes of warp and weft, a multi-axis design including 60 degrees oblique may be used. Of these, plain weaving is preferable in that the denseness of the structure, the uniformity of physical properties and performance can be ensured.

  Fabric manufacture may be selected from various looms used for weaving ordinary industrial fabrics, for example, shuttle looms, water jet looms, air jet looms, rapier looms, projectile looms, etc. .

  When the fiber fabric is a knitted fabric, a single knitting structure such as a single knitting such as a single tricot knitting, a single cord knitting, a single atlas knitting, a weft knitting such as a flat knitting, a rubber knitting or a pearl knitting, or a combination thereof. And those composed of double tissues. Moreover, when the said fiber fabric is a nonwoven fabric, what is manufactured by a chemical bond, a thermal bond, a needle punch, a spunlace, a stitch bond, a spun bond, a melt blow, wet, etc. is mentioned.

  Further, the single yarn thickness of the yarn used in the present invention may be the same or different, and is preferably in the range of 0.5 to 8 dtex, for example. Further, the strength of the single yarn is preferably 5.4 cN / dtex or more, more preferably 8 cN / dtex or more, in order to satisfy the physical characteristics as an airbag.

  The cross-sectional shape of the single fiber of the fiber is not particularly limited, such as round, flat, triangular, rectangular, parallelogram, hollow, star shape, etc., but those with a round cross section are preferable in terms of productivity and cost. Moreover, the thing of a flat cross section is preferable at the point that the thickness of a base fabric can be made thin and the storage property of a bag becomes good. Alternatively, a plurality of yarns having different thicknesses or cross-sectional shapes may be integrated by combining, twisting, or the like.

  The total fineness of these synthetic fibers is preferably 155 to 500 dtex. If it is less than 155 dtex, the strength of the fabric may not be maintained, and if it is greater than 500 dtex, the thickness of the base fabric increases, and the bag may have poor storage properties.

The base fabric preferably has a basis weight of 190 g / m ² or less and a tensile strength of 600 N / cm or more. If the basis weight and tensile strength are within this range, it can be said that it is light and excellent in physical properties. Here, the basis weight refers to the weight of the base fabric in an unprocessed state before application of an air permeability treatment agent to be described later.

The cover factor when the base fabric is a woven fabric is preferably 1500 to 2500. If the cover factor is smaller than 1500, the opening of the fabric becomes large and it is difficult to obtain the airtightness of the bag. If the cover factor is larger than 2500, the thickness of the fabric increases and the bag can be stored. May be worse. Here, the cover factor means that the warp yarn total fineness is D ₁ (dtex), the warp yarn density is N ₁ (lines / 2.54 cm), the weft total yarn fineness is D ₂ (dtex), and the weft yarn density Is N ₂ (lines / 2.54 cm), (D ₁ × 0.9) ^1/2 × N ₁ + (D ₂ × 0.9) ^1/2 × N ₂ .

  These fabrics may be coated with a resin or the like for the purpose of improving heat resistance and reducing air permeability.

  Examples of the resin used for the coating include halogen-containing rubbers such as chloroprene rubber, high baron rubber, and fluorine rubber, silicone rubber, ethylene propylene rubber, ethylene propylene terpolymer rubber, nitrile butadiene rubber, styrene butadiene rubber, isobutylene isoprene rubber, Rubbers such as urethane rubber and acrylic rubber, and halogen-containing resins such as vinyl chloride resin, vinylidene chloride resin, chlorinated polyolefin resin and fluororesin, urethane resin, acrylic resin, ester resin, amide resin, olefin resin and silicone resin These are used, and these are used alone or in combination. Of these, silicone rubber and silicone resin are preferable in terms of excellent heat resistance and weather resistance.

The adhesion amount of the resin is preferably 40 g / m ² or less by dry weight. The lower limit is preferably 5 g / m ² . If the amount of adhesion is less than 5 g / m ² , the air permeability of the fabric tends to be high, and there is a tendency for the air tightness of the airbag to occur. If the amount of adhesion exceeds 40 g / m ² , the thickness of the fabric increases. Therefore, there is a possibility that a problem arises in the storing property of the airbag.

  Furthermore, for the purpose of smoothly deploying the airbag, it is preferable to perform a process for reducing the friction of the coating film obtained by the non-venting agent. Specifically, as the treatment, a method of applying a fine powder such as talc to the coating, a method of coating by treating the treatment agent with a substance that reduces adhesiveness after curing such as an organic titanium compound, and Examples thereof include a method of imparting irregularities to the coating using an embossing device or the like.

  What is necessary is just to select suitably the sewing thread | yarn used for the said outer periphery sewing thread | yarn 4 and the fixed cloth sewing thread | yarn from what is generally called a synthetic fiber sewing thread | yarn, and what is used as an industrial sewing thread | yarn. For example, nylon 6, nylon 66, nylon 46, polyester, polymer polyolefin, fluorine-containing, vinylon, aramid, carbon, glass, steel and the like may be used, and any of spun yarn, filament twisted yarn or filament resin processed yarn may be used.

  In addition, the stitching may be performed by seams applied to ordinary airbags such as main stitching, double chain stitching, one-sided stitching, over stitching, safety stitching, staggered stitching, and flat stitching.

  The thickness of the sewing thread is preferably 700 dtex (equivalent to 20th) to 2800 dtex (equivalent to 0th), and the number of stitches is preferably 2 to 10 stitches / cm. If multiple rows of stitch lines are required, the distance between the stitch lines may be about 2.2 to 8.0 mm and a multi-needle type sewing machine may be used. If the sewing part distance is not long, one needle You may sew several times with a sewing machine. In the case where a plurality of cut base fabrics are used as the airbag body, the plurality of cut base fabrics may be stacked and stitched one by one or one by one.

  The curtain airbag according to the present invention has a belt-like cloth or restraint called a hanging strap or gas flow regulating cloth on the inside and a flap on the outside of the airbag for suppressing the protrusion of the airbag to the occupant side and controlling the thickness during inflation. A cloth or the like may be provided.

  Further, depending on the characteristics of the inflator to be used, a heat-resistant protective cloth or a mechanical reinforcing cloth for protecting from the hot gas may be provided around the inflator outlet. These protective cloths and reinforcing cloths may be made of heat-resistant materials such as heat-resistant fiber materials such as wholly aromatic polyamide fibers, wholly aromatic polyester fibers, PBO fibers, polyimide fibers, and fluorine-containing fibers. Alternatively, a fabric separately produced using a thread thicker than the airbag body base fabric may be used. Moreover, you may use what gave the heat resistant coating agent to the fabric.

EXAMPLES Hereinafter, the present invention will be described with reference to examples. However, the present invention is not necessarily limited to the examples.

<Evaluation method of breaking strength>
Using an autograph (AG-IS) manufactured by Shimadzu Corporation, the lower end of the fixing cloth 3 through which the bolt was passed through the mounting hole 6 was grasped, pulled at a speed of 500 mm / min, and the strength when it was broken was measured. Furthermore, the state of breakage at that time was confirmed.

Example 1
Weaving nylon 66 fibers with a total fineness of 470 dtex and 72 filaments (single yarn strength 8.5 cN / dtex, round cross section) in a water jet loom so that the weft density of both warps and wefts is 46 / 2.54 cm. A plain woven fabric having a cover factor of 1885, a basis weight of 180 g / m ² , and a tensile strength of 600 N / cm was obtained. The tensile strength of the woven fabric is the strength when a sample cut to a width of 50 mm and a length of 550 mm is pulled at a speed of 200 mm / min with an autograph tensile tester and broken.
The fabric is scoured and heat-set at 185 ° C. for 30 seconds, and then coated with a silicone coating resin (main component methyl vinyl silicone rubber, heat-curing type) with a knife coater so that the coating amount is 35 g / m ^2. Thereafter, heat treatment was performed at 180 ° C. for 2 minutes to obtain a coated fabric.

  The obtained coated fabric was cut into a 140 mm × 102 mm rectangle, and at the same time, six attachment holes were punched with a Φ5 mm bolt to obtain a cut fabric having the shape shown in FIG. The mounting hole is provided at the center of the left and right ends, 15 mm below the upper end bent portion in the shape of FIG. 2 after bending. Furthermore, in order to bend easily, the slit was provided in the planned bending part from the attachment hole to the cutting cloth outer side from the position of 10 mm to the edge part (solid line part of FIG. 3). The obtained cut cloth was folded three times so as to be a 70 mm × 34 mm rectangle to obtain a fixed cloth. The fixed cloth apparently consisted of six base cloths, and had bent portions at the upper and left and right ends. When the breaking strength of the obtained fixed fabric was measured, it was 4500 N, which was high enough to withstand deployment of the curtain airbag. In the upper part from the attachment hole 6, there was no unraveling or removal of the weft, and the weft was broken by being cut.

Comparative Example 1
A coated fabric was obtained in the same manner as in Example 1, and was cut into six pieces of 70 mm × 34 mm rectangles, and at the same time, attachment holes were punched one by one with Φ5 mm bolts in each cut cloth. Six sheets of the obtained cut cloth were overlapped to obtain a fixed cloth having the shape shown in FIG. The obtained fixed fabric did not have a bending part and the tensile strength was 1800N. In the upper part from the attachment hole 6, the weft was unwound and pulled out.

Comparative Example 2
A coated fabric is obtained in the same manner as in Example 1, and is cut into three 140 mm × 34 mm rectangles. At the same time, two attachment holes are punched into each cut cloth with a Φ5 mm bolt, and the shape shown in FIG. 8 is cut. I got a cloth. Three sheets of the obtained cut cloth were overlapped and the long side was folded in half to obtain a fixed cloth of 70 mm × 34 mm (FIG. 7). The obtained fixed fabric was apparently six-layered, but the bent portion was present only at the upper end, and the tensile strength was 2900N. In the upper part from the attachment hole 6, the weft was unwound and a drop was also observed.

Comparative Example 3
A coated fabric was obtained in the same manner as in Example 1, and two sheets were cut into 70 mm × 102 mm rectangles. At the same time, three attachment holes were punched into each of the cut cloths with φ5 mm bolts, and the shape shown in FIG. 10 was cut. I got a cloth. The obtained two cut cloths were overlapped and the long side was folded in three to obtain a fixed cloth of 70 mm × 34 mm (FIG. 9). The obtained fixed fabric was apparently six-layered, but the bent portions were present only at the left and right ends, and the tensile strength was 1800N. As in Comparative Example 1, the wefts were unwound from the upper part.

Example 2
A cut cloth was obtained in the same manner as in Example 1 except that the size of the cut cloth was 140 mm × 60 mm (FIG. 11). Furthermore, in order to bend easily, the slit was provided in the planned bending part from the attachment hole to the cutting cloth outer side from the position of 10 mm to the edge part (solid line part of FIG. 11). This cut cloth was folded three times into a 70 mm × 20 mm rectangle to obtain a fixed cloth. The fixed cloth apparently consisted of six base cloths, and had bent portions at the upper and left and right ends (FIG. 12). When the tensile strength of the obtained fixed fabric was measured, it was 2700 N and had a high value that could withstand the deployment of the curtain airbag. In the upper part from the attachment hole 6, there was no unraveling or removal of the weft, and the weft was broken by being cut. Moreover, this tensile strength is higher than the case shown in the comparative example 1, and it turns out that sufficient intensity | strength is obtained although the cutting shape is small.

Example 3
A cut fabric was obtained in the same manner as in Example 1 except that the size of the cut was 140 mm × 84 mm (FIG. 13). Furthermore, in order to bend easily, the slit was provided in the planned bending part from the attachment hole to the cutting cloth outer side from the position of 10 mm to the edge part (solid line part of FIG. 13). This cut cloth was folded three times so as to be a 70 mm × 28 mm rectangle to obtain a fixed cloth. The fixed cloth apparently consisted of six base cloths, and had bent portions at the upper and left and right ends (FIG. 14). When the tensile strength of the obtained fixed fabric was measured, it was 4000 N, which was high enough to withstand deployment of the curtain airbag. In the upper part from the attachment hole 6, there was no unraveling or removal of the weft, and the weft was broken by being cut. This tensile strength is higher than that shown in Comparative Example 2, and it can be seen that sufficient strength is obtained despite the small cutting shape.

Example 4
In the same manner as in Example 1, a 140 mm × 102 mm rectangular cut cloth was obtained, and six attachment holes were punched with Φ5 mm bolts to obtain a cut cloth having the shape shown in FIG. Furthermore, in order to bend easily, a slit of 5 mm in length from the attachment hole to the inside of the cut cloth is provided in the planned bending portion, and a slit is also provided from the attachment hole to the outside of the cut cloth from the position of 10 mm to the end. (FIG. 15 solid line part). This cut cloth was folded three times to form a 70 mm × 34 mm rectangle to obtain a fixed cloth (FIG. 16). The fixed cloth is apparently composed of six base cloths, and has bent portions at the upper end and the left and right ends (the slits are not provided in all the left and right end bent portions). When the tensile strength of the obtained fixed cloth was measured, it was 4200 N, which was high enough to withstand deployment of the curtain airbag. In the upper part from the attachment hole 6, there was no unraveling or removal of the weft, and the weft was broken by being cut. The tensile strength is lower than that of Example 1 because a part of the slit is formed on the upper side from the attachment hole, but the upper and left and right end bent portions are integrally formed from one piece of fabric, so that the comparative example It is extremely high compared to 1, and it can be seen that sufficient strength is obtained.

Example 5
A cut cloth was obtained in the same manner as in Example 1 except that the cut shape was as shown in FIG. This cut cloth was folded three times to form a 70 mm × 34 mm rectangle to obtain a fixed cloth (FIG. 4). The fixed cloth apparently consisted of four base cloths, and had bent portions at the upper end and the left and right ends. When the tensile strength of the obtained fixed fabric was measured, it was 2700 N and had a high value that could withstand the deployment of the curtain airbag. In the upper part from the attachment hole 6, there was no unraveling or removal of the weft, and the weft was broken by being cut. This tensile strength is higher than that in the case of 6 sheets as shown in Comparative Example 1, and it can be seen that sufficient strength is obtained despite the small number of sheets.

Comparative Example 4
In the same manner as in Comparative Example 1, four sheets of cut cloth were obtained. The obtained four cut cloths were superposed to obtain a fixed cloth (not shown). The obtained fixed fabric did not have a bending part, and the tensile strength was 1200N. As in Comparative Example 1, the wefts were unwound and pulled out from the attachment hole 6 at the top.

Comparative Example 5
A cut cloth was obtained in the same manner as in Example 5 except that the cut shape was as shown in FIG. This cut cloth was folded three times so as to be a 70 mm × 34 mm rectangle to obtain a fixed cloth (FIG. 17). The fixed cloth apparently consists of four base cloths and has bent portions at the upper end and the left and right ends, but one each. When the tensile strength of the obtained fixed cloth was measured, it was 1800 N, which was higher than that of Comparative Example 4, but it was not a reliable tensile strength as a fixing point. In the upper part from the attachment hole 6, the weft was broken by being cut, but the right and left wefts were also broken.

It is a schematic plan view which shows an example of the curtain airbag of this invention. It is a schematic plan view (a) which shows an example of the fixed cloth 3 used by this invention, and schematic sectional drawing (b) * (c). It is a schematic plan view which shows the cutting cloth which comprises the fixed cloth of FIG. 2, and its folding procedure. It is a schematic plan view (a) and schematic sectional views (b) and (c) showing another example of the fixed cloth 3 used in the present invention. It is a schematic plan view which shows the cutting cloth which comprises the fixed cloth of FIG. It is a schematic plan view (a) and schematic cross-sectional views (b) and (c) showing a fixed fabric of Comparative Example 1. It is a schematic plan view (a) and schematic cross-sectional views (b) and (c) showing a fixed fabric of Comparative Example 2. It is a schematic plan view which shows the cutting cloth which comprises the fixed cloth of FIG. It is a schematic plan view (a) and schematic cross-sectional views (b) and (c) showing a fixed fabric of Comparative Example 3. FIG. 10 is a schematic plan view showing a cut cloth constituting the fixed cloth of FIG. 9. 6 is a schematic plan view showing a cut cloth constituting the fixed cloth of Example 2. FIG. FIG. 6 is a schematic plan view (a) and schematic cross-sectional views (b) and (c) showing a fixed fabric of Example 2. FIG. 6 is a schematic plan view showing a cut cloth that constitutes the fixed cloth of Example 3. FIG. It is a schematic plan view (a) and schematic cross-sectional views (b) and (c) showing a fixed fabric of Example 3. FIG. 6 is a schematic plan view showing a cut cloth that constitutes a fixed cloth of Example 4. FIG. 6 is a schematic plan view (a) and schematic cross-sectional views (b) and (c) showing a fixed fabric of Example 4. FIG. 10 is a schematic plan view showing a cut cloth constituting the fixed cloth of Comparative Example 5. FIG. It is a schematic plan view (a) and schematic cross-sectional views (b) and (c) showing a fixed fabric of Comparative Example 5. It is a schematic plan view (a) and schematic sectional views (b) and (c) showing another example of the fixed cloth 3 used in the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Curtain airbag 2 Airbag main body 3 Airbag fixed cloth 4 Peripheral sewing thread 5 Fixed cloth sewing thread 6 Mounting hole 7 Upper end bending part 8 Right end bending part 9 Left end bending part 10 Slit 11 Cutting cloth 12 for fixing cloth

Claims (3)

A curtain airbag comprising an airbag body and a plurality of airbag fixing cloths having attachment holes for inserting attachment members, wherein the airbag fixing cloth is formed by folding a single base cloth, A curtain airbag having at least three bent portions at the upper end and two at the left and right ends. The curtain airbag according to claim 1, wherein the airbag fixing cloth further has slits at left and right ends. The curtain airbag according to claim 1 or 2, wherein the airbag fixing cloth is apparently composed of six or more base cloths.

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